hold back; keep from being perceived by others, as of emotions or expressions of emotions; "She conceals her anger well"
keep under control; keep in check; "suppress a smile"; "Keep your temper"; "keep your cool"
wait before acting
secure and keep for possible future use or application; "The landlord retained the security deposit"; "I reserve the right to disagree"
hold back, as of a danger or an enemy; check the expansion or influence of; "Arrest the downward trend"; "Check the growth of communism in Sout East Asia"; "Contain the rebel movement"; "Turn back the tide of communism"